Six-degree of Freedom Retrospective Motion Correction using Spherical Navigator Echoes (SNAV)
Patricia Johnson 1,2 , Junmin Liu 1 , Trevor Wade 1 , and Maria Drangova 1,2
Imaging Research Laboratories, Robarts
Research Institute, London, Ontario, Canada,
of Medical Biophysics, Schulich School of Medicine &
Dentistry, Western University, London, Ontario, Canada
Spherical navigator echo (SNAV) techniques are promising
for measuring rigid body motion in all 6 degrees of
freedom. In this abstract we demonstrate for the first
time - the accuracy of retrospective
preRot-SNAV-correction of motion by interleaving the
SNAVs within a 3D imaging pulse sequence (efgre-SNAV).
We have performed a preliminary evaluation of this
sequence and determined that the interleaved SNAVs
perform comparably to stand alone SNAVs in measurements
of rotation and translations; they agree within 1.0 and
0.43mm. We have also demonstrated successful
retrospective correction of a phantom image.
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